package api;

import cn.hutool.core.util.StrUtil;
import cn.hutool.crypto.digest.MD5;
import cn.hutool.json.JSONUtil;
import common.ApplicationVariable;
import lombok.SneakyThrows;
import model.ResultData;
import util.DBUtil;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;

/**
 * 提供注册的接口
 * todo:对用户进行唯一验证
 */
@WebServlet("/reg")
public class RegServlet extends HttpServlet {
    @SneakyThrows
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType(ApplicationVariable.RESPONSE_CONTENT_TYPE);
        int state=200;
        int data=-1;//受影响的行数
        String msg="未知错误!";
        //1.得到前段并验证前端的参数
        String username=req.getParameter("username");
        String password=req.getParameter("password");
        if(!StrUtil.isBlank(username)&&!StrUtil.isBlank(password)){
            //2.进行注册操作
            Connection connection= DBUtil.getConnection();
            String sql="insert into userinfo(username,password) values (?,?)";
            PreparedStatement statement=connection.prepareStatement(sql);
            statement.setString(1,username);
            statement.setString(2, MD5.create().digestHex(password));
            data=statement.executeUpdate();
            DBUtil.close(null,statement,connection);
        }else{
            msg="参数错误！";
        }
        //3.将操作的结果返回给前端
        ResultData resultData=new ResultData();
        resultData.setState(state);
        resultData.setData(data);
        resultData.setMsg(msg);
        resp.getWriter().println(JSONUtil.toJsonStr(resultData));
    }
}
